If its a rasta castle id make sure to include more color patterns involving rasta colors (red,green,yellow). Id also make a large pixel pot leaf somewhere, jamaican flag (will be easy to recreate just need to be fairly sizey, floor layout or large one on wall behind throne in throne room), and at least some kind of large bong art of somekind. Maybe a smoke sauna that you sit in to bake out. And you definitely must have some kind of large kitchen to suppy all the munchies. Also inclue the word IRIE alot on signs and art, Jamaican slang word basically meaning everything is alright/cool.
Ignore my airport.
PS
Rickshaws
Craft stalls
Dispensary
Reggae Music Stage
Pool area with straw topped cabanas
Beaches!
Outdoor grill
Gazebo/Patio Furniture (umbrella tables)